National Gypsum Construction Guide - 12th Edition

RECOMMENDATIONS
Z FURRING
1. Begin application of
Z furring members by
positioning first piece
vertically at a corner.
Locate the piece on the
wall adjacent to the wall
being insulated first.
2. Insulation thickness
determines distance of
Z furring web from wall
being insulated. At the
appropriate distance, and
with wide flange pointing
toward applicator, secure
Z furring with appropriate
fasteners through short
flange. (Note to Specifier:
Power driven fasteners are
not recommended for use
with masonry block.)
3. Install 24" wide floor-toceiling
insulation board,
pressed snugly against web
of first Z. Install next Z with
wide flange overlapping
edge of first insulation
board. Fasten to wall
through narrow flange.
INSTALLATION
4. Continue in this manner,
with Z furring 24" o.c. to
end of wall. Locate last Z
so that web is located a
distance equal to insulation
thickness from adjoining
wall. Cut last insulation
board to fit remaining
space.
5. At exterior corner, attach
the Z through its wide
flange, with narrow flange
extending beyond the
corner. Begin with a
narrow strip of floor-toceiling
insulation, wider
than insulation thickness
but not exceeding 3".
Continue application of
furring and insulation
progressively as described
above.
6. At windows, doors and trim
areas, use wood nailers
(nom. 2" wide x insulation
thickness plus 1/32"). Use
the nailers also at wall-floor
angles to support trim and
provide backing for base.
7. Apply gypsum board with
1" Type S Screws through
flanges of Z furring, 12" o.c.
Z FURRING CHANNEL HORIZONTAL INSTALLATION
WITH DRYWALL ADHESIVE
LAMINATION
1. Masonry or monolithic
concrete shall be above
grade, dry, free of dust,
loose particles, oil, grease
or other foreign material.
2. Joint compound used as
adhesive shall be mixed to
a consistency thick enough
to allow a 2" daub to stick
to the underside of a broad
knife held parallel to the
floor.
3. Apply 2" to 2 1/2" diameter
daubs of adhesive 1/2"
thick, 16" o.c. in both
directions to the masonry
wall. The adhesive layout
must provide for a row of
daubs located a maximum
of 2" from board ends, and
care must be exercised to
center daubs on vertical
joints. No more adhesive
shall be applied to the wall
than will be covered with
board in 15 minutes.
Approximate coverage for
joint compound (powder)
used as an adhesive is 30-
35 lbs./1000 sq. ft.
DAUB METHOD USING
JOINT COMPOUND
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4. Cut gypsum board to allow
for 1/8" to 1/4" clearance
between board and floor to
prevent potential wicking.
5. Install gypsum board by
hand pressing each board
tight to the wall making
certain that all daubs are in
positive contact with the
board.
6. Support boards at each
corner to keep them from
slipping to the floor by use
of a concrete nail driven
through a small block of
nominal 1" lumber.
7. Butt boards to each
previously positioned
board to ensure flush joints.
8. If necessary to hold boards
straight, plumb and in
proper alignment, drive
masonry nails through
small wood blocks and into
masonry at high points
only. After adhesive is dry
(24 - 48 hours) remove
temporary nails.
9. Fill all holes and treat joints
with tape and joint
compound.
NATIONAL GYPSUM BOARD PRODUCTS
109
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